docs: def _handle_tag_close_close(self):
          """Handle the ending of a closing tag (``</foo>``)."""
          strip = lambda tok: tok.text.rstrip().lower()
          closing = self._pop()
          if len(closing) != 1 or (not isinstance(closing[0], tokens.Text) or
                                   strip(closing[0]) != strip(self._stack[1])):
              self._fail_route()
          self._emit_all(closing)
          self._emit(tokens.TagCloseClose())
          return self._pop()